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<html lang="en">
<head>
  <meta charset="UTF-8">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <title>Document</title>
</head>
<body>
  <div id="root"></div>


  <script crossorigin src="https://unpkg.com/react@18.3.1/umd/react.development.js"></script>
  <script crossorigin src="https://unpkg.com/react-dom@18.3.1/umd/react-dom.development.js"></script>
  <script crossorigin src="https://unpkg.com/babel-standalone@6.26.0/babel.min.js"></script>

  <script type="text/babel">

    class App extends React.Component {
      constructor() {
        super()
        this.state = {
          age: 20,
          flowers: ['艾莎', '骄傲', '小白兔']
        }
        this.getFlowers = this.getFlowers.bind(this)
      }

      getFlowers() {
        return this.state.flowers.map(el => <li key={el}>{ el }</li>)
      }

      render() {
        const { age, flowers } = this.state
        return (
          <div>
            <p>{ 10 + 20 }</p>
            <p>{ 10 + age }</p>
            <p>{ age >= 18 ? '成年人' : '未成年人' }</p>
            <p>{ flowers.join(', ') }</p>
            <p>{ this.getFlowers() }</p>
          </div>
        )
      }

    }
    
    const root = ReactDOM.createRoot(document.querySelector('#root'))
    root.render(<App/>)
  </script>
</body>
</html>